/*
 * Copyright (c) 2018-2021, Arm Limited. All rights reserved.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

#include <assert.h>
#include <errno.h>
#include <debug.h>

#include <cactus_message_loop.h>
#include <cactus_platform_def.h>
#include <drivers/arm/pl011.h>
#include <drivers/console.h>
#include <lib/aarch64/arch_helpers.h>
#include <lib/tftf_lib.h>
#include <lib/xlat_tables/xlat_mmu_helpers.h>
#include <lib/xlat_tables/xlat_tables_v2.h>

#include <plat_arm.h>
#include <plat/common/platform.h>
#include <platform_def.h>
#include <sp_debug.h>
#include <sp_helpers.h>
#include <spm_helpers.h>
#include <std_svc.h>

#include "cactus_def.h"
#include "cactus_tests.h"
#include "cactus.h"

/* Host machine information injected by the build system in the ELF file. */
extern const char build_message[];
extern const char version_string[];

extern void secondary_cold_entry(void);

/* Global ffa_id */
ffa_id_t g_ffa_id;

/*
 *
 * Message loop function
 * Notice we cannot use regular print functions because this serves to both
 * "primary" and "secondary" VMs. Secondary VM cannot access UART directly
 * but rather through Hafnium print hypercall.
 *
 */

static void __dead2 message_loop(ffa_id_t vm_id, struct mailbox_buffers *mb)
{
	smc_ret_values ffa_ret;
	ffa_id_t destination;

	/*
	* This initial wait call is necessary to inform SPMD that
	* SP initialization has completed. It blocks until receiving
	* a direct message request.
	*/

	ffa_ret = ffa_msg_wait();

	for (;;) {
		VERBOSE("Woke up with func id: %x\n", ffa_func_id(ffa_ret));

		if (ffa_func_id(ffa_ret) == FFA_ERROR) {
			ERROR("Error: %x\n", ffa_error_code(ffa_ret));
			break;
		}

		if (ffa_func_id(ffa_ret) != FFA_MSG_SEND_DIRECT_REQ_SMC32 &&
		    ffa_func_id(ffa_ret) != FFA_MSG_SEND_DIRECT_REQ_SMC64 &&
		    ffa_func_id(ffa_ret) != FFA_INTERRUPT) {
			ERROR("%s(%u) unknown func id 0x%x\n",
				__func__, vm_id, ffa_func_id(ffa_ret));
			break;
		}

		if (ffa_func_id(ffa_ret) == FFA_INTERRUPT) {
			/*
			 * Received FFA_INTERRUPT in waiting state.
			 * The interrupt id is passed although this is just
			 * informational as we're running with virtual
			 * interrupts unmasked and the interrupt is processed
			 * by the interrupt handler.
			 */
			ffa_ret = ffa_msg_wait();
			continue;
		}

		destination = ffa_dir_msg_dest(ffa_ret);
		if (destination != vm_id) {
			ERROR("%s(%u) invalid vm id 0x%x\n",
				__func__, vm_id, destination);
			break;
		}

		if (!cactus_handle_cmd(&ffa_ret, &ffa_ret, mb)) {
			break;
		}
	}

	panic();
}

static const mmap_region_t cactus_mmap[] __attribute__((used)) = {
	/* PLAT_ARM_DEVICE0 area includes UART2 necessary to console */
	MAP_REGION_FLAT(PLAT_ARM_DEVICE0_BASE, PLAT_ARM_DEVICE0_SIZE,
			MT_DEVICE | MT_RW),
	/* scratch memory allocated to be used for running SMMU tests */
	MAP_REGION_FLAT(PLAT_CACTUS_MEMCPY_BASE, PLAT_CACTUS_MEMCPY_RANGE,
			MT_MEMORY | MT_RW),
	{0}
};

static void cactus_print_memory_layout(unsigned int vm_id)
{
	INFO("Secure Partition memory layout:\n");

	INFO("  Text region            : %p - %p\n",
		(void *)CACTUS_TEXT_START, (void *)CACTUS_TEXT_END);

	INFO("  Read-only data region  : %p - %p\n",
		(void *)CACTUS_RODATA_START, (void *)CACTUS_RODATA_END);

	INFO("  Data region            : %p - %p\n",
		(void *)CACTUS_DATA_START, (void *)CACTUS_DATA_END);

	INFO("  BSS region             : %p - %p\n",
		(void *)CACTUS_BSS_START, (void *)CACTUS_BSS_END);

	INFO("  RX                     : %p - %p\n",
		(void *)get_sp_rx_start(vm_id),
		(void *)get_sp_rx_end(vm_id));

	INFO("  TX                     : %p - %p\n",
		(void *)get_sp_tx_start(vm_id),
		(void *)get_sp_tx_end(vm_id));
}

static void cactus_plat_configure_mmu(unsigned int vm_id)
{
	mmap_add_region(CACTUS_TEXT_START,
			CACTUS_TEXT_START,
			CACTUS_TEXT_END - CACTUS_TEXT_START,
			MT_CODE);
	mmap_add_region(CACTUS_RODATA_START,
			CACTUS_RODATA_START,
			CACTUS_RODATA_END - CACTUS_RODATA_START,
			MT_RO_DATA);
	mmap_add_region(CACTUS_DATA_START,
			CACTUS_DATA_START,
			CACTUS_DATA_END - CACTUS_DATA_START,
			MT_RW_DATA);
	mmap_add_region(CACTUS_BSS_START,
			CACTUS_BSS_START,
			CACTUS_BSS_END - CACTUS_BSS_START,
			MT_RW_DATA);

	mmap_add_region(get_sp_rx_start(vm_id),
			get_sp_rx_start(vm_id),
			(CACTUS_RX_TX_SIZE / 2),
			MT_RO_DATA);

	mmap_add_region(get_sp_tx_start(vm_id),
			get_sp_tx_start(vm_id),
			(CACTUS_RX_TX_SIZE / 2),
			MT_RW_DATA);

	mmap_add(cactus_mmap);
	init_xlat_tables();
}

static void register_secondary_entrypoint(void)
{
	smc_args args;

	args.fid = FFA_SECONDARY_EP_REGISTER_SMC64;
	args.arg1 = (u_register_t)&secondary_cold_entry;

	tftf_smc(&args);
}

int tftf_irq_handler_dispatcher(void)
{
	ERROR("%s\n", __func__);

	return 0;
}

void __dead2 cactus_main(bool primary_cold_boot)
{
	assert(IS_IN_EL1() != 0);

	struct mailbox_buffers mb;
	smc_ret_values ret;

	/* Get current FFA id */
	smc_ret_values ffa_id_ret = ffa_id_get();
	ffa_id_t ffa_id = ffa_endpoint_id(ffa_id_ret);
	if (ffa_func_id(ffa_id_ret) != FFA_SUCCESS_SMC32) {
		ERROR("FFA_ID_GET failed.\n");
		panic();
	}

	if (primary_cold_boot == true) {
		/* Clear BSS */
		memset((void *)CACTUS_BSS_START,
		       0, CACTUS_BSS_END - CACTUS_BSS_START);

		mb.send = (void *) get_sp_tx_start(ffa_id);
		mb.recv = (void *) get_sp_rx_start(ffa_id);

		/* Configure and enable Stage-1 MMU, enable D-Cache */
		cactus_plat_configure_mmu(ffa_id);
	}

	/*
	 * The local ffa_id value is held on the stack. The global g_ffa_id
	 * value is set after BSS is cleared.
	 */
	g_ffa_id = ffa_id;

	enable_mmu_el1(0);

	/* Enable IRQ/FIQ */
	enable_irq();
	enable_fiq();

	if (primary_cold_boot == false) {
		goto msg_loop;
	}

	if (ffa_id == SPM_VM_ID_FIRST) {
		console_init(CACTUS_PL011_UART_BASE,
			     CACTUS_PL011_UART_CLK_IN_HZ,
			     PL011_BAUDRATE);

		set_putc_impl(PL011_AS_STDOUT);

	} else {
		set_putc_impl(HVC_CALL_AS_STDOUT);
	}

	/* Below string is monitored by CI expect script. */
	NOTICE("Booting Secure Partition (ID: %x)\n%s\n%s\n",
		ffa_id, build_message, version_string);

	if (ffa_id == (SPM_VM_ID_FIRST + 2)) {
		VERBOSE("Mapping RXTX Region\n");
		CONFIGURE_AND_MAP_MAILBOX(mb, PAGE_SIZE, ret);
		if (ffa_func_id(ret) != FFA_SUCCESS_SMC32) {
			ERROR(
			    "Failed to map RXTX buffers. Error: %x\n",
			    ffa_error_code(ret));
			panic();
		}
	}

	cactus_print_memory_layout(ffa_id);

	register_secondary_entrypoint();

	/* Invoking Tests */
	ffa_tests(&mb);

msg_loop:
	/* End up to message loop */
	message_loop(ffa_id, &mb);

	/* Not reached */
}